Pictish stones are ancient stone monuments found primarily in Scotland, dating back to the early medieval period, around the 5th to 8th centuries. These stones are often decorated with intricate carvings, including symbols, animals, and human figures, which are believed to represent the Picts, a group of Celtic tribes. The purpose of these stones remains a topic of debate among historians. Some suggest they served as markers for burial sites or commemorated important events, while others believe they were used for religious or ceremonial purposes. The symbols on the stones are unique and have yet to be fully deciphered, adding to their mystery.